CA2321803A1 - Slotted head pedicle screw assembly - Google Patents

Slotted head pedicle screw assembly Download PDF

Info

Publication number
CA2321803A1
CA2321803A1 CA002321803A CA2321803A CA2321803A1 CA 2321803 A1 CA2321803 A1 CA 2321803A1 CA 002321803 A CA002321803 A CA 002321803A CA 2321803 A CA2321803 A CA 2321803A CA 2321803 A1 CA2321803 A1 CA 2321803A1
Authority
CA
Canada
Prior art keywords
head
fastener
coupling element
rod
insert
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002321803A
Other languages
French (fr)
Other versions
CA2321803C (en
Inventor
Yves Crozet
Gregory Martin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Stryker European Holdings I LLC
Original Assignee
Howmedica Osteonics Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Howmedica Osteonics Corp filed Critical Howmedica Osteonics Corp
Publication of CA2321803A1 publication Critical patent/CA2321803A1/en
Application granted granted Critical
Publication of CA2321803C publication Critical patent/CA2321803C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7035—Screws or hooks, wherein a rod-clamping part and a bone-anchoring part can pivot relative to each other
    • A61B17/7037—Screws or hooks, wherein a rod-clamping part and a bone-anchoring part can pivot relative to each other wherein pivoting is blocked when the rod is clamped
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7074—Tools specially adapted for spinal fixation operations other than for bone removal or filler handling
    • A61B17/7076—Tools specially adapted for spinal fixation operations other than for bone removal or filler handling for driving, positioning or assembling spinal clamps or bone anchors specially adapted for spinal fixation
    • A61B17/7082—Tools specially adapted for spinal fixation operations other than for bone removal or filler handling for driving, positioning or assembling spinal clamps or bone anchors specially adapted for spinal fixation for driving, i.e. rotating, screws or screw parts specially adapted for spinal fixation, e.g. for driving polyaxial or tulip-headed screws
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7032—Screws or hooks with U-shaped head or back through which longitudinal rods pass
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86—Pins or screws or threaded wires; nuts therefor
    • A61B17/8605—Heads, i.e. proximal ends projecting from bone
    • A61B17/861—Heads, i.e. proximal ends projecting from bone specially shaped for gripping driver

Abstract

A pedicle screw assembly includes a fastener 30 including a tip end 32 for insertion into bone 90 and an expandable head 34 at the opposite end of the fastener. The expandable head 34 has an outer surface 44 including a convex portion, a recess 46 having an inner surface 48 and defining an inner dimension, and at least one slot 50 extending between the inner and outer surfaces thereof for allowing expansion of the head. The assembly also has an insert 56 which can be positioned at least partially in the recess 46, the insert 56 having an outer surface 62 and defining an outer dimension that is greater than the inner dimension of the recess 46. The assembly includes a coupling element 70 including a rod receiving opening 94, a bore 80 for receiving the head of the fastener 30, and a seat 88 for receiving the head 34 of the fastener, the seat 88 including a concave portion for receiving the convex portion of the head and allowing the fastener 30 to pivot relative to the coupling element 70 before being locked therein. After an orthopedic rod 92 has been positioned within the coupling element 70, a locking element 96 associated with the coupling element locks the orthopedic rod 92 in the rod-receiving opening 94. The locking element 96 is adapted to be forced against an orthopedic rod arranged in the rod receiving opening 94, to in turn force the insert 56 into the recess of the expandable head 34 so that the outer dimension 62 of the insert 56 bears against the inner dimension 48 of the head 34, thereby expanding the outer surface 44 of the head against the seat 88 of the coupling element 70 for locking the fastener 30 from further pivotal movement relative to the coupling element 70. In other preferred embodiments, the head is expandable by virtue of the material of which it is made such as carbon fiber.
CA002321803A 1999-10-07 2000-09-28 Slotted head pedicle screw assembly Expired - Lifetime CA2321803C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/414,272 1999-10-07
US09/414,272 US6554834B1 (en) 1999-10-07 1999-10-07 Slotted head pedicle screw assembly

Publications (2)

Publication Number Publication Date
CA2321803A1 true CA2321803A1 (en) 2001-04-07
CA2321803C CA2321803C (en) 2008-04-08

Family

ID=23640731

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002321803A Expired - Lifetime CA2321803C (en) 1999-10-07 2000-09-28 Slotted head pedicle screw assembly

Country Status (6)

Country Link
US (1) US6554834B1 (en)
EP (1) EP1090595B1 (en)
JP (2) JP4594509B2 (en)
AU (1) AU771400B2 (en)
CA (1) CA2321803C (en)
DE (1) DE60007253T2 (en)

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CA2321803C (en) 2008-04-08
JP5080622B2 (en) 2012-11-21

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